ReadWriteWeb

Twitter is famous for its use of Ruby on Rails, but as it has scaled the service up it has migrated some of its code to other technologies. The company began by migrating its back-end message queue to Scala (which runs on the Java Virtual Machine), continued by rebuilding its back-end search in Java and most recently replaced its search front-end with a Java server.

InfoQ is running an interview with Twitter engineer Evan Weaver who explains more about the shift.

Maciej Ceglowski created Pinboard in 2009 "partly out of frustration with a redesign of Delicious that I felt removed a lot of utility from the site, and partly because I had long wanted to have a boomarking site that would archive my bookmarks," according to the About page. Since then, the site has become a popular alternative to Delicious and Ceglowski is now able to make a living on it.

Pinboard runs entirely on a traditional LAMP stack, and it runs amazingly fast. We talked with Ceglowski about the Pinboard architecture and his development process.

Back in April we told you about an augmented reality (AR) developer challenge that was launched by mobile AR platform junaio that promised $5,000 to the creator of the most interesting and unique junaio content channel. Last week, a handful of judges (including myself) determined the winner from a group of finalists with a unanimous vote for archINFORM - a channel that provides architectural information about the buildings around you.

Our beloved Twitter has been digging its own grave for several months now. Recently, the service has experienced an absurd amount of downtime. There have been numerous posts calling for Twitter to be replaced. With so many problems plaguing Twitter, it seems the company could care less. Here are a few factors that are helping to kill Twitter.